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| NJM2123 DUAL OPERATIONAL AMPLIFIER WITH SWITCH GENERAL DESCRIPTION The NJM2123 is a operational amplifier with analog switch ( 2 circuit of 2-input/1-output ). It is applicable to the audio part for Video ( VTR,LD...) and the Car-stereo. The NJM2123 has the same electrical characteristic of the NJM2112,and is low saturation output type. The mode of switch is improved from the current control type ( NJM2120:1 circuit of 2-input/1-output ) to the voltage control type.So,it is easy to use. FEATURES Single Supply Operating Voltage Slew Rate Analog Switch Function Wide Unity Gain Bandwidth Package Outline Bipolar Technology PIN CONFIGURATION PIN FUNCTION 1.V + PACKAGE OUTLINE NJM2123D NJM2123M ( +4V~+20V ) ( 3V/s typ. ) ( 10MHz typ. ) DIP16,DMP16,SSOP16 NJM2123V 9.GND 10.SW R 11.IN2 B +INPUT 12.IN2 B -INPUT 13.OUT2 14.IN2 A -INPUT 15.IN2 A +INPUT 16.SW2 2.SW1 3.IN1 A +INPUT 4.IN1 A -INPUT 5.OUT1 6.IN1 B -INPUT 7.IN1 B +INPUT 8.SW C NJM2123D NJM2123M NJM2123V EQUIVALENT CIRCUIT Ver.2003-03-17 -1- NJM2123 ABSOLUTE MAXIMUM RATINGS ( Ta=25C ) PARAMETER Supply Voltage Differential Input Voltage Input Voltage Control Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL + V VID VIC VCTR PD Topr Tstg RATINGS 20 ( 10) 14 + 20(10)note:Less than V (note) + 20(10)note:Less than V ( DIP8 ) 700 ( DMP8 ) 300 ( SSOP8 ) 300 -30~+85 -40~+125 UNIT V V V V mW C C ELECTRICAL CHARACTERISTICS ( V+=5V,Ta=25C ) PARAMETER Operating Current Input Offset Voltage Input Offset Current Input Bias Current Large Signal Voltage Gain Maximum Output Voltage Swing 1 Maximum Output Voltage Swing 2 Input Common Mode Voltage Range Common Mode Rejection Ratio Supply Voltage Rejection Ratio Slew Rate Gain Bandwidth Product Crosstalk Channel Separation Switch Threshold Voltage SYMBOL ICC VIO IIO IB AV VOM1 VOM2 VICM CMR SVR SR GB CT CS Vth TEST CONDITION VIN=2.5V,RL= RS10k RL10K +V /V =2.5V,RL2k +V /V =2.5V,RL10k MIN. 60 2.0 2.3 1.5 60 60 2.0 TYP. 6.0 1.0 10 100 80 2.2 2.4 74 80 3 10 90 120 2.5 MAX. 8.0 6.0 200 300 4.0 3.0 UNIT mA mV nA nA dB V V V dB dB V/s MHz dB dB V AV=1,VIN=2V~3V f=1kHz f=1kHz Internal Vth ( note1 ) Applied circuit voltage gain is desired to be operated within the range of 3dB to 30 dB. ( note2 ) Special care being required for input common mode voltage range and the oscillation due to the capacitive load when operating on voltage follower. ( note3 ) "Crosstalk" is defined about leak of signal on the same circuit. ( note4 ) "Channel Separation" is defined about leak of signal between 2 circuits. ( note5 ) Vth is possible to adjust by external parts. ( note6 ) Voltage for V--PIN has to be supplied earlier than V+-PIN in case of two supply voltage. -2- Ver.2003-03-17 NJM2123 TYPICAL CHARACTERISTICS In case of single supply voltage ( V =5V ) + SWITCHING MECHANISM The switch circuit of NJM2123 consist of comparators for switch and circuit for switch threshold voltage ( Vth ) due to establish threshold of comparator.Vth=Ii x Ri=2.5V in case of above Figure. Comparator selects INPUT ( A or B ) by compare of control voltage ( VCTR ) and threshold voltage ( Vth ) and control of operating current of Amp ( INPUT ). INPUT A is selected in case of VCTR>Vth and INPUT B is selected in case of VCTR -3- NJM2123 ABOUT ADJUSTMENT OF VTH The switch threshold voltage ( Vth ) is possible to adjust by external parts to SW C/SW R.It needs to be satisfy with condition of VthV+-2V. This reason is cased by equivalent circuit of comparator for switch. The Vth has to be adjust in case that supply voltage is less than 5V ( 2.5V ). Adjustment method is as following. ADJUSTMENT OF VTH In case of Ii=100A,Ri=25k,Re ( External Resistor ) Internal Vth ( Single supply ) Internal Vth ( Two supply ) Vth,2.5V ( Single supply ) Vth>2.5V ( Single supply ) -4- Ver.2003-03-17 NJM2123 TYPICAL CHARACTERISTICS Ver.2003-03-17 -5- NJM2123 TYPICAL CHARACTERISTICS -6- Ver.2003-03-17 NJM2123 TYPICAL CHARACTERISTICS Ver.2003-03-17 -7- NJM2123 TYPICAL CHARACTERISTICS -8- Ver.2003-03-17 NJM2123 [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Ver.2003-03-17 -9- |
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